[Bug binutils/23109] New: aarch64: opcode wrongly disassembled as sdot

[i-sourceware-org-2018-2p98rzwefkh at rf dot risimo.net]

https://sourceware.org/bugzilla/show_bug.cgi?id=23109

            Bug ID: 23109
           Summary: aarch64: opcode wrongly disassembled as sdot
           Product: binutils
           Version: 2.30
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: i-sourceware-org-2018-2p98rzwefkh at rf dot risimo.net
  Target Milestone: ---

This is about the opcode 0fbcef26 which is disassembled as sdot.

$ hexdump bin2
0000000 26 ef bc 0f
0000004
$ objdump -D -b binary -maarch64 -Mno-aliases bin2

bin2:     file format binary


Disassembly of section .data:

0000000000000000 <.data>:
   0:   0fbcef26    sdot    v6.2s, v25.8b, v28.4b[3]
$

The opcode in question:

         33222222 22221111 111111
         10987654 32109876 54321098 76543210
opcode = 00001111 10111100 11101111 00100110 = 0x08fbcef26

According to the docu I have here the 10th bit should be 0 but it is 1 in the
opcode. Therefore the opcode should be rejected.

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